My son who is 4.5 yrs already has a torso 0f 16.5! I have read that some of the older regents actually have harness slots that measure higher than the newer ones. I don't mind purchasing an older model, as I have found a few stores that have brand new 2006 models NIB! I am wanting to get one with the higher measuring top slots for extra growth in torso since he will need it!